Update a DID document with new properties
AI agents use update-did to create or update resources in Xrpl mcp — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Xrpl mcp environment.
This tool creates or modifies data reversibly by updating DID (Decentralized Identifier) documents with new properties. The operation is Write-category because it changes ledger state but does not irreversibly destroy data (Destructive), execute arbitrary code (Execute), or move funds (Financial).
From the tool's definition Tool name 'update-did' and description 'Update a DID document with new properties' indicate modification of existing data (DID documents) on the XRP Ledger.
Documented attack patterns abuse exactly the kind of access update-did gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Xrpl mcp, and nothing reaches the server without passing your rules. This is the rule we recommend for update-did:
{
"version": "1",
"default": "deny",
"tools": {
"update-did": {
"limits": [
{
"counter": "update-did_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}update-did stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
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Update a DID document with new properties. It is categorised as a Write tool in the Xrpl mcp MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Xrpl MCP server in PolicyLayer and add a rule for update-did: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Xrpl mcp. Nothing to install.
update-did is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the update-did rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for update-did. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
update-did is provided by the Xrpl MCP server (romthpt/mcp-xrpl). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Xrpl mcp, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
71 Xrpl mcp tools catalogued and risk-classified — across an index of 43,000+ MCP servers.